I purchased these glass balls for anal play. They're technically not anal safe, meaning that you can lose them inside yourself because they don’t have a string or base that stays outside. I personally from experience don’t lose toys inside myself because I don’t elevate my bottom to allow anything to get pulled too far inside. I also don’t push toys inside further than a few inches. I personally love the way of passing these glass balls. They feel awesome to push out slowly. I’ve also used them inside my partners pussy when performing vaginal sex. I think they are actually used for strengthening the pelvic floor with exercises involving moving these balls around inside the vagina as a form of exercise. My partner doesn’t seem to enjoy this practice, so I use them on myself.

Still use these occasionally for an anal toy. Still haven’t lost one yet! I think I’m going to buy the larger pair next.